Outbreak of mumps.
The highly contagious viral infection causes pain and swelling in the cheek and jaw, serious fatigue and fever.
University authorities have warned students with the symptoms to stay home.
As there have been a number of cases of Mumps in the Dublin area recently @TCDHealthP recommends that students & staff check that they have had 2 MMR vaccines & to get vaccinated if unprotected. Advice and info on Mumps can be found here https://t.co/LqbupZhnou pic.twitter.com/KeN4serWti
— Trinity College Dublin (@tcddublin) 8 February 2019
Blackrock's clash with St Michael's in the Leinster Schools Cup quarter-finals has been put off.
The HSE has warned anyone who hasn't had both rounds of the MMR jab they are "quite likely" to get mumps.
In a letter to staff and students, Dr David McGrath - director of the college health service at Trinity College - said: "I would recommend that all students check their childhood vaccination history with their family GP."
He added that anyone who develops symptoms "must stay away from college for five days after the swelling develops".